Hi,
Stick with a drill. Using a torch to make the hole is not as straight forward as you may think.
Check these:
http://www5a.biglobe.ne.jp/~kitamiki/holeeng.html (uses a dremel-type appliance and diamond-surfaced bits )
http://www.artglass1.com/drilling-holes-glass.htm (They have a PDF that explains the procedure. This place also sells the core bits that I think you may need)